xref: /openbmc/linux/drivers/input/mouse/navpoint.c (revision 95e9fd10) 
1 /*
2  * Synaptics NavPoint (PXA27x SSP/SPI) driver.
3  *
4  * Copyright (C) 2012 Paul Parsons <lost.distance@yahoo.com>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  */
10 
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/module.h>
14 #include <linux/platform_device.h>
15 #include <linux/clk.h>
16 #include <linux/delay.h>
17 #include <linux/gpio.h>
18 #include <linux/input.h>
19 #include <linux/input/navpoint.h>
20 #include <linux/interrupt.h>
21 #include <linux/mutex.h>
22 #include <linux/pxa2xx_ssp.h>
23 #include <linux/slab.h>
24 
25 /*
26  * Synaptics Modular Embedded Protocol: Module Packet Format.
27  * Module header byte 2:0 = Length (# bytes that follow)
28  * Module header byte 4:3 = Control
29  * Module header byte 7:5 = Module Address
30  */
31 #define HEADER_LENGTH(byte)	((byte) & 0x07)
32 #define HEADER_CONTROL(byte)	(((byte) >> 3) & 0x03)
33 #define HEADER_ADDRESS(byte)	((byte) >> 5)
34 
35 struct navpoint {
36 	struct ssp_device	*ssp;
37 	struct input_dev	*input;
38 	struct device		*dev;
39 	int			gpio;
40 	int			index;
41 	u8			data[1 + HEADER_LENGTH(0xff)];
42 };
43 
44 /*
45  * Initialization values for SSCR0_x, SSCR1_x, SSSR_x.
46  */
47 static const u32 sscr0 = 0
48 	| SSCR0_TUM		/* TIM = 1; No TUR interrupts */
49 	| SSCR0_RIM		/* RIM = 1; No ROR interrupts */
50 	| SSCR0_SSE		/* SSE = 1; SSP enabled */
51 	| SSCR0_Motorola	/* FRF = 0; Motorola SPI */
52 	| SSCR0_DataSize(16)	/* DSS = 15; Data size = 16-bit */
53 	;
54 static const u32 sscr1 = 0
55 	| SSCR1_SCFR		/* SCFR = 1; SSPSCLK only during transfers */
56 	| SSCR1_SCLKDIR		/* SCLKDIR = 1; Slave mode */
57 	| SSCR1_SFRMDIR		/* SFRMDIR = 1; Slave mode */
58 	| SSCR1_RWOT		/* RWOT = 1; Receive without transmit mode */
59 	| SSCR1_RxTresh(1)	/* RFT = 0; Receive FIFO threshold = 1 */
60 	| SSCR1_SPH		/* SPH = 1; SSPSCLK inactive 0.5 + 1 cycles */
61 	| SSCR1_RIE		/* RIE = 1; Receive FIFO interrupt enabled */
62 	;
63 static const u32 sssr = 0
64 	| SSSR_BCE		/* BCE = 1; Clear BCE */
65 	| SSSR_TUR		/* TUR = 1; Clear TUR */
66 	| SSSR_EOC		/* EOC = 1; Clear EOC */
67 	| SSSR_TINT		/* TINT = 1; Clear TINT */
68 	| SSSR_PINT		/* PINT = 1; Clear PINT */
69 	| SSSR_ROR		/* ROR = 1; Clear ROR */
70 	;
71 
72 /*
73  * MEP Query $22: Touchpad Coordinate Range Query is not supported by
74  * the NavPoint module, so sampled values provide the default limits.
75  */
76 #define NAVPOINT_X_MIN		1278
77 #define NAVPOINT_X_MAX		5340
78 #define NAVPOINT_Y_MIN		1572
79 #define NAVPOINT_Y_MAX		4396
80 #define NAVPOINT_PRESSURE_MIN	0
81 #define NAVPOINT_PRESSURE_MAX	255
82 
83 static void navpoint_packet(struct navpoint *navpoint)
84 {
85 	int finger;
86 	int gesture;
87 	int x, y, z;
88 
89 	switch (navpoint->data[0]) {
90 	case 0xff:	/* Garbage (packet?) between reset and Hello packet */
91 	case 0x00:	/* Module 0, NULL packet */
92 		break;
93 
94 	case 0x0e:	/* Module 0, Absolute packet */
95 		finger = (navpoint->data[1] & 0x01);
96 		gesture = (navpoint->data[1] & 0x02);
97 		x = ((navpoint->data[2] & 0x1f) << 8) | navpoint->data[3];
98 		y = ((navpoint->data[4] & 0x1f) << 8) | navpoint->data[5];
99 		z = navpoint->data[6];
100 		input_report_key(navpoint->input, BTN_TOUCH, finger);
101 		input_report_abs(navpoint->input, ABS_X, x);
102 		input_report_abs(navpoint->input, ABS_Y, y);
103 		input_report_abs(navpoint->input, ABS_PRESSURE, z);
104 		input_report_key(navpoint->input, BTN_TOOL_FINGER, finger);
105 		input_report_key(navpoint->input, BTN_LEFT, gesture);
106 		input_sync(navpoint->input);
107 		break;
108 
109 	case 0x19:	/* Module 0, Hello packet */
110 		if ((navpoint->data[1] & 0xf0) == 0x10)
111 			break;
112 		/* FALLTHROUGH */
113 	default:
114 		dev_warn(navpoint->dev,
115 			 "spurious packet: data=0x%02x,0x%02x,...\n",
116 			 navpoint->data[0], navpoint->data[1]);
117 		break;
118 	}
119 }
120 
121 static irqreturn_t navpoint_irq(int irq, void *dev_id)
122 {
123 	struct navpoint *navpoint = dev_id;
124 	struct ssp_device *ssp = navpoint->ssp;
125 	irqreturn_t ret = IRQ_NONE;
126 	u32 status;
127 
128 	status = pxa_ssp_read_reg(ssp, SSSR);
129 	if (status & sssr) {
130 		dev_warn(navpoint->dev,
131 			 "unexpected interrupt: status=0x%08x\n", status);
132 		pxa_ssp_write_reg(ssp, SSSR, (status & sssr));
133 		ret = IRQ_HANDLED;
134 	}
135 
136 	while (status & SSSR_RNE) {
137 		u32 data;
138 
139 		data = pxa_ssp_read_reg(ssp, SSDR);
140 		navpoint->data[navpoint->index + 0] = (data >> 8);
141 		navpoint->data[navpoint->index + 1] = data;
142 		navpoint->index += 2;
143 		if (HEADER_LENGTH(navpoint->data[0]) < navpoint->index) {
144 			navpoint_packet(navpoint);
145 			navpoint->index = 0;
146 		}
147 		status = pxa_ssp_read_reg(ssp, SSSR);
148 		ret = IRQ_HANDLED;
149 	}
150 
151 	return ret;
152 }
153 
154 static void navpoint_up(struct navpoint *navpoint)
155 {
156 	struct ssp_device *ssp = navpoint->ssp;
157 	int timeout;
158 
159 	clk_prepare_enable(ssp->clk);
160 
161 	pxa_ssp_write_reg(ssp, SSCR1, sscr1);
162 	pxa_ssp_write_reg(ssp, SSSR, sssr);
163 	pxa_ssp_write_reg(ssp, SSTO, 0);
164 	pxa_ssp_write_reg(ssp, SSCR0, sscr0);	/* SSCR0_SSE written last */
165 
166 	/* Wait until SSP port is ready for slave clock operations */
167 	for (timeout = 100; timeout != 0; --timeout) {
168 		if (!(pxa_ssp_read_reg(ssp, SSSR) & SSSR_CSS))
169 			break;
170 		msleep(1);
171 	}
172 
173 	if (timeout == 0)
174 		dev_err(navpoint->dev,
175 			"timeout waiting for SSSR[CSS] to clear\n");
176 
177 	if (gpio_is_valid(navpoint->gpio))
178 		gpio_set_value(navpoint->gpio, 1);
179 }
180 
181 static void navpoint_down(struct navpoint *navpoint)
182 {
183 	struct ssp_device *ssp = navpoint->ssp;
184 
185 	if (gpio_is_valid(navpoint->gpio))
186 		gpio_set_value(navpoint->gpio, 0);
187 
188 	pxa_ssp_write_reg(ssp, SSCR0, 0);
189 
190 	clk_disable_unprepare(ssp->clk);
191 }
192 
193 static int navpoint_open(struct input_dev *input)
194 {
195 	struct navpoint *navpoint = input_get_drvdata(input);
196 
197 	navpoint_up(navpoint);
198 
199 	return 0;
200 }
201 
202 static void navpoint_close(struct input_dev *input)
203 {
204 	struct navpoint *navpoint = input_get_drvdata(input);
205 
206 	navpoint_down(navpoint);
207 }
208 
209 static int __devinit navpoint_probe(struct platform_device *pdev)
210 {
211 	const struct navpoint_platform_data *pdata =
212 					dev_get_platdata(&pdev->dev);
213 	struct ssp_device *ssp;
214 	struct input_dev *input;
215 	struct navpoint *navpoint;
216 	int error;
217 
218 	if (!pdata) {
219 		dev_err(&pdev->dev, "no platform data\n");
220 		return -EINVAL;
221 	}
222 
223 	if (gpio_is_valid(pdata->gpio)) {
224 		error = gpio_request_one(pdata->gpio, GPIOF_OUT_INIT_LOW,
225 					 "SYNAPTICS_ON");
226 		if (error)
227 			return error;
228 	}
229 
230 	ssp = pxa_ssp_request(pdata->port, pdev->name);
231 	if (!ssp) {
232 		error = -ENODEV;
233 		goto err_free_gpio;
234 	}
235 
236 	/* HaRET does not disable devices before jumping into Linux */
237 	if (pxa_ssp_read_reg(ssp, SSCR0) & SSCR0_SSE) {
238 		pxa_ssp_write_reg(ssp, SSCR0, 0);
239 		dev_warn(&pdev->dev, "ssp%d already enabled\n", pdata->port);
240 	}
241 
242 	navpoint = kzalloc(sizeof(*navpoint), GFP_KERNEL);
243 	input = input_allocate_device();
244 	if (!navpoint || !input) {
245 		error = -ENOMEM;
246 		goto err_free_mem;
247 	}
248 
249 	navpoint->ssp = ssp;
250 	navpoint->input = input;
251 	navpoint->dev = &pdev->dev;
252 	navpoint->gpio = pdata->gpio;
253 
254 	input->name = pdev->name;
255 	input->dev.parent = &pdev->dev;
256 
257 	__set_bit(EV_KEY, input->evbit);
258 	__set_bit(EV_ABS, input->evbit);
259 	__set_bit(BTN_LEFT, input->keybit);
260 	__set_bit(BTN_TOUCH, input->keybit);
261 	__set_bit(BTN_TOOL_FINGER, input->keybit);
262 
263 	input_set_abs_params(input, ABS_X,
264 			     NAVPOINT_X_MIN, NAVPOINT_X_MAX, 0, 0);
265 	input_set_abs_params(input, ABS_Y,
266 			     NAVPOINT_Y_MIN, NAVPOINT_Y_MAX, 0, 0);
267 	input_set_abs_params(input, ABS_PRESSURE,
268 			     NAVPOINT_PRESSURE_MIN, NAVPOINT_PRESSURE_MAX,
269 			     0, 0);
270 
271 	input->open = navpoint_open;
272 	input->close = navpoint_close;
273 
274 	input_set_drvdata(input, navpoint);
275 
276 	error = request_irq(ssp->irq, navpoint_irq, 0, pdev->name, navpoint);
277 	if (error)
278 		goto err_free_mem;
279 
280 	error = input_register_device(input);
281 	if (error)
282 		goto err_free_irq;
283 
284 	platform_set_drvdata(pdev, navpoint);
285 	dev_dbg(&pdev->dev, "ssp%d, irq %d\n", pdata->port, ssp->irq);
286 
287 	return 0;
288 
289 err_free_irq:
290 	free_irq(ssp->irq, &pdev->dev);
291 err_free_mem:
292 	input_free_device(input);
293 	kfree(navpoint);
294 	pxa_ssp_free(ssp);
295 err_free_gpio:
296 	if (gpio_is_valid(pdata->gpio))
297 		gpio_free(pdata->gpio);
298 
299 	return error;
300 }
301 
302 static int __devexit navpoint_remove(struct platform_device *pdev)
303 {
304 	const struct navpoint_platform_data *pdata =
305 					dev_get_platdata(&pdev->dev);
306 	struct navpoint *navpoint = platform_get_drvdata(pdev);
307 	struct ssp_device *ssp = navpoint->ssp;
308 
309 	free_irq(ssp->irq, navpoint);
310 
311 	input_unregister_device(navpoint->input);
312 	kfree(navpoint);
313 
314 	pxa_ssp_free(ssp);
315 
316 	if (gpio_is_valid(pdata->gpio))
317 		gpio_free(pdata->gpio);
318 
319 	return 0;
320 }
321 
322 #ifdef CONFIG_PM_SLEEP
323 static int navpoint_suspend(struct device *dev)
324 {
325 	struct platform_device *pdev = to_platform_device(dev);
326 	struct navpoint *navpoint = platform_get_drvdata(pdev);
327 	struct input_dev *input = navpoint->input;
328 
329 	mutex_lock(&input->mutex);
330 	if (input->users)
331 		navpoint_down(navpoint);
332 	mutex_unlock(&input->mutex);
333 
334 	return 0;
335 }
336 
337 static int navpoint_resume(struct device *dev)
338 {
339 	struct platform_device *pdev = to_platform_device(dev);
340 	struct navpoint *navpoint = platform_get_drvdata(pdev);
341 	struct input_dev *input = navpoint->input;
342 
343 	mutex_lock(&input->mutex);
344 	if (input->users)
345 		navpoint_up(navpoint);
346 	mutex_unlock(&input->mutex);
347 
348 	return 0;
349 }
350 #endif
351 
352 static SIMPLE_DEV_PM_OPS(navpoint_pm_ops, navpoint_suspend, navpoint_resume);
353 
354 static struct platform_driver navpoint_driver = {
355 	.probe		= navpoint_probe,
356 	.remove		= __devexit_p(navpoint_remove),
357 	.driver = {
358 		.name	= "navpoint",
359 		.owner	= THIS_MODULE,
360 		.pm	= &navpoint_pm_ops,
361 	},
362 };
363 
364 module_platform_driver(navpoint_driver);
365 
366 MODULE_AUTHOR("Paul Parsons <lost.distance@yahoo.com>");
367 MODULE_DESCRIPTION("Synaptics NavPoint (PXA27x SSP/SPI) driver");
368 MODULE_LICENSE("GPL");
369 MODULE_ALIAS("platform:navpoint");
370